Guy Crimson

Guy Crimson, originally known as the Red Primordial (Rouge), is the oldest and one of the most powerful Demon Lords in the That Time I Got Reincarnated as a Slime universe. Summoned to the human world millennia ago by a foolish king, he destroyed the very kingdom that summoned him and adopted the name "Guy" inspired by the agonizing screams of his victims, awakening soon after as a True Demon Lord and assuming the role of mediator of world balance alongside the True Dragon Velzard. Possessing an extremely proud, confident, and extravagant personality, Guy easily transitions from a relaxed, flirtatious, and hedonistic attitude to a cold, calculating, and merciless demeanor. He harbors a deep boredom due to his overwhelming strength, leading him to respect and be interested only in individuals who demonstrate true power and worth—such as Rimuru, Leon, and his eternal rival Rudra—while treating the weak with absolute indifference. Guy Crimson, also known as Rouge or the Red Primordial Demon, is one of the most powerful beings in the Tensei Shitara Slime Datta Ken series. As the first Demon Lord and the self-proclaimed Mediator of the world, his arsenal of powers is virtually limitless, blending brutal physical strength, cataclysmic magic, and absolute theft and copying abilities. Here are all the known powers and abilities of Guy Crimson, categorized: Ultimate Skills: Lucifer, Lord of Pride: Guy's original Ultimate Skill. The core power of this skill is Perfect Reproduction. With it, Guy can instantly analyze, understand, and copy almost any magic, art, or skill he sees his opponents use, including other Ultimate Skills. Nodens, God of Abyss: The evolution of Lucifer at the end of the series. Inspired by Rimuru's evolutions, Guy elevates his power to a Divine level. This skill encompasses Thought Acceleration, which speeds up mental processing by millions of times; Universal Perception, granting absolute sensory and spatial awareness; and Enhanced Absolute Copy, allowing him to not only perfectly copy abilities but also modify and adapt them to his own combat style. Notable Combat Skills and Copies: Wrathful King Satanael: Guy copied this Ultimate Skill from Milim Nava. It converts anger directly into magic, generating infinite energy. Because the skill can consume the user's sanity, Guy consciously restricts it to about 40% to 90% of its maximum capacity to maintain perfect control and reasoning. Time Stopping: Guy possesses the ability to stop time, as well as move freely in worlds where time has been suspended by other entities. Calamity Claw: A physical-magical claw attack that injects a lethal poison capable of corroding the opponent's mind starting from the point of impact. Catastrophia Eclipse: A technique that accumulates energy to cover the opponent in Curse Scars. These scars block healing magic, hinder natural regeneration, and passively drain the target's energy, making it highly effective against opponents with larger mana reserves. Destruction Magic and Spells: Death Streak: One of the deadliest Nuclear Strike spells in the world. Guy unleashes a black light with a 10-kilometer range that passes through physical matter and forcefully rewrites the genetic and spiritual structure of living beings, possessing a 99.9999% fatality rate. Napalm Burst: A heat explosion that summons hellfire shaped like a dragon. Guy can enhance this spell using Effect Overlap, fusing it with magical barriers and his ultimate skills to cause irreversible damage. Intrinsic and Physical Abilities: Form Change: Guy can biologically alter his gender for tactical purposes. His male form focuses on the peak of physical combat, brute strength, and endurance. His female form optimizes his brain and body purely for mental calculations, skill processing, and highly complex magic. Godspeed Regeneration: Even if severely injured, he can regenerate organs, limbs, and his very soul almost instantly. Immunity and Magic Resistance: Guy possesses a natural protection that almost completely nullifies magic-based damage, along with total immunity to negative status effects and spiritual attacks. God-level Swordsmanship: Although he is a Demon focusing on magic, Guy fights in close combat on equal footing with the strongest swordsmen in the series, such as Rudra and Chloe. He wields the Genesis Class sword named World, forged from the core of a star, after having given his previous sword, Tenma, to Milim.